I'm unable to control the keyboard light for this keyboard. Its turned off after sleep.
Tried xset led [1-32] and brightnessctl
dmesg entry:
[33339.121199] usb 2-1.8.5: reset full-speed USB device number 11 using ehci-pci [33339.230948] input: eSport Arena eSport Arena Penta Keys as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.8/2-1.8.5/2-1.8.5:1.0/0003:2EA8:2123.0008/input/input25 [33339.289582] hid-generic 0003:2EA8:2123.0008: input,hidraw2: USB HID v1.11 Keyboard [eSport Arena eSport Arena Penta Keys] on usb-0000:00:1d.0-1.8.5/input0 [33339.291560] input: eSport Arena eSport Arena Penta Keys as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.8/2-1.8.5/2-1.8.5:1.1/0003:2EA8:2123.0009/input/input26 [33339.349400] hid-generic 0003:2EA8:2123.0009: input,hiddev2,hidraw3: USB HID v1.11 Keyboard [eSport Arena eSport Arena Penta Keys] on usb-0000:00:1d.0-1.8.5/input1
lsusb:
Bus 002 Device 011: ID 2ea8:2123
There are 2 windows applications that work but... they work on windows

Links below:
https://shop.friendlyfireesports.com...uct/penta-keys
https://www.californiaaccess.pl/pl/c...ownload&fid=41
The second one is even able to set colors of individual keys.
I could also create some wireshark dumps from changing the backlight!